[ Mw9.1 Simulation of Nankai megathrust earthquakes ] - Duration: 4:45. Models to clarify the size of the Nankai megathrust earthquake and changes in occurrence intervals, simulations using such models, and simulations of crustal deformations and tsunamis based on the simulations were employed. All of these great earthquakes have resulted in damaging tsunamis, which are particularly damaging due to the Japanese population being concentrated on the Taiheiyō Belt, especially the coastal cities of Tokyo and Osaka, the two most populous in Japan. "Tectonic evolution of the Japanese island arc system", "The age and origin of the Pacific islands: a geological overview", "Splay fault and megathrust earthquake slip in the Nankai Trough", "Broad, weak regions of the Nankai Megathrust and implications for shallow coseismic slip", "Simulation of Earthquake Generation Process in a Complex System of Faults", "Probability of a great earthquake to recur in the Tokai district, Japan", "A Disaster Prevention and Earthquake Experience Guide", "Study: Damage from Nankai quake could hit 1,240 trillion yen", "A Disaster to Dwarf 3/11? It will enhance any encyclopedic page you visit with the magic of the WIKI 2 technology. The eastern Nankai Trough is a unique site where many shallow, very low frequency earthquakes (sVLFEs) are recorded by nearby broadband ocean bottom seismometers. exposed to tsunamis, which may reach five meters or higher. ... in the Nankai … Along the Nankai Trough, megathrust earthquakes with a magnitude 8 or more occur repeatedly. For the last few decades, many destructive earthquakes and tsunamis occurred in the world. A study reported in 2016 found that the largest megathrust quakes are associated with downgoing slabs with the shallowest dip, so … 1). Abstract. Abstract. For earthquakes along the Nankai megathrust fault generally, see, Learn how and when to remove this template message, https://en.wikipedia.org/w/index.php?title=Nankai_earthquakes&oldid=839138140, Earthquake clusters, swarms, and sequences, Articles containing Japanese-language text, Creative Commons Attribution-ShareAlike License, This page was last edited on 1 May 2018, at 14:31. Nankai megath­rust earthquakes are great megath­rust earth­quakes that occur along the Nankai megathrust – the fault under the Nankai Trough – which forms the plate in­ter­face be­tween the sub­duct­ing Philip­pine Sea Plate and the over­rid­ing Amurian Plate (part of the Eurasian Plate), which dips be­neath south­west­ern Hon­shu, Japan. They occur with a return period of 100 to 200 years, and there is a high probability of one in the 21st century, as the most recent was the 1946 Nankaidō earthquake. Takahashi Suzuki 7,831 views. This behaviour has been reproduced by modelling the viscoelastic response of the megathrust fault plane with lateral variations in both convergence rate and frictional properties. The Nankai megathrust is thought to have caused at least 12 great earthquakes in the last ca. The pattern of historical seismicity reveals that the megathrust surface is segmented, with five separate zones of rupturing identified, conventionally labeled A–E, from west to east. In 1999, the likelihood of the occurrence of a great earthquake in the Tokai area in the period 2000-2010 was estimated to be in the range of 0.35–0.45. Nankai megathrust earthquakes are great megathrust earthquakes that occur along the Nankai megathrust – the fault under the Nankai Trough – which forms the plate interface between the subducting Philippine Sea Plate and the overriding Amurian Plate (part of the Eurasian Plate), which dips beneath southwestern Honshu, Japan. The Nankai-Trough earthquake has various occurence pattern. A future great earthquake involving rupture along this and possibly other segments has been proposed as a major risk for the southern coast of Honshu. This study estimates the fiscal impact of the anticipated Nankai Trough Megathrust Earthquake on both the national and local Japanese governments to identify their sovereign risk. It occurred almost two years after the 1944 Tōnankai earthquake, which ruptured the adjacent part of the Nankai megathrust. [An interplate megathrust earthquake] is predicted in the near future along the Nankai Trough off southwestern Japan. 4:45. Examples The pattern of historical seismicity reveals that the megathrust surface is segmented, with five separate zones of rupturing identified, conventionally labelled A–E, from west to east. Mw9.1 Simulation of Nankai megathrust earthquakes / Osaka Japan The next immense natural disaster in Japan? First, we estimate the impact of the Great East Japan Earthquake on local public finance using panel data regressions on 2008–2015 fiscal data. Large interplate megathrust earthquakes occurred in the Nankai subduction zone off Southwest Japan with an interval of ~100 to 150 years. The area remains seismically active, and future earthquakes are anticipated, with a high risk of a Nankai earthquake in the near future, which could be potentially very damaging. This 1707 event ruptured all of the segments of the Nankai megathrust simultaneously, the only earthquake known to have done this, with an estimated magnitude of 8.6 or 8.7. You could also do it yourself at any point in time. [1] The megathrust boundary extends about 700 km from the southern end of Kyūshū to the triple junction with the Okhotsk Plate near Mount Fuji. Historical Nankai-Suruga megathrust earthquakes recorded by tsunami and terrestrial mass movement deposits on the Shirasuka coastal lowlands, Shizuoka Prefecture, Japan Ed Garrett, Osamu Fujiwara, Svenja Riedesel, Jan Walstra, Koen Deforce, Yusuke Yokoyama, Sabine Schmidt, Helmut Brückner, Marc De Batist, Vanessa MA Heyvaert, and and the QuakeRecNankai Team Some sources use the Julian calendar for the earlier earthquakes in the list. Historically, this seismic region hosted many major earthquakes, and the current national tsunami hazard assessments in Japan consider megathrust events as those having moment magnitudes between 9.0 and 9.1. The source code for the WIKI 2 extension is being checked by specialists of the Mozilla Foundation, Google, and Apple. Devastating earthquakes such as these have occurred at intervals of 100 to 150 years (e.g., Ando 1975 ; Ishibashi 2004 ), so we should be prepared for more of them in the future. All the dates shown in the table use the Gregorian calendar. For the last few decades, many destructive earthquakes and tsunamis occurred in the world. 1300 years. Earthquakes involving the A+B segments are generally referred to as Nankai (literally South Sea) earthquakes, C+D Tōnankai (literally Southeast Sea) earthquakes and E Tōkai (literally East Sea) earthquakes. Megathrust earthquakes result from a stick-slip frictional instability on the interplate fault ( 14 ). These hav… Recently, Kumamoto Earthquake occurred in 2006. Historical Nankai earthquakes are as follows; some of these coincided with or followed earthquakes in the Tōnankai or Tōkai zones, and the 1498 Meiō Nankaidō earthquake may or may not have involved the Nankai zone: This article is about megathrust earthquakes that affect the Nankai region specifically. 1498 Meio earthquake intensity.png 512 × 512; 37 KB Following the 2004 event, other great megathrust earthquake ruptures progressed southward along the margin in the 2005 M w 8.6 Nias (e.g., Konca et al., 2007) and the 2007 M w 8.5 and M w 7.9 Sumatra earthquakes (e.g., Konca et al., 2008). The pattern of historical seismicity reveals that the megathrust surface is segmented, with five separate zones of rupturing identified, conventionally labelled A–E, from west to east. If … On all but one occasion, rupture of segment C (±D ±E) has been followed by rupture of segments A+B within a few years. A study by the Japan Society of Civil Engineers in 2018 estimated that the long-term damage from the earthquake could result in 1,240 trillion yen in economic losses over a 20-year period. The Nankai earthquakes (南海地震, Nankai jishin) are major megathrust earthquakes that affect the Nankaidō (Southern Sea Circuit) region of Japan, west of the Tōnankai region (Southeastern Sea) and Tōkai region (Eastern Sea), and are caused by ruptures in the Nankai zone of the Nankai megathrust, specifically segments A and/or B. Earthquakes seem to occur re-peatedly ; however, SW Japan has experienced ~M7 earthquakes such the! Occurred almost two years after the 1944 Tōnankai earthquake, which may five., so … Summary in: Tokunaga S, Okiyama M ( eds ) Model analyses the.: 4:45 always look as professional and up-to-date Trough in Southwest Japan have been megathrust earthquakes associated! Faults have caused the largest earthquakes ever recorded in human history its southwestern end, there another. Along the Nankai Trough earthquakes earthquake disasters impact of the Nankai Trough is the expression. Occurred in the Nankai Trough, situated in the Nankai … Nankai–Tonankai megathrust earthquakes associated! Thus, assessing their potential maximum magnitude and respective return periods is vital for seismic-tsunami hazard assessment for... Tokunaga S, Okiyama M ( eds ) Model analyses on the recovery and regeneration from earthquake disasters you! December 21, 1946, at 04:19 JST last ca one recorded case ( the Hōei! Devastating tsunamis a stick-slip frictional instability on the recovery and regeneration from earthquake disasters earthquake measured between and... Earthquake Simulation intervals of 100 to 150 years `` Catalog of Damaging earthquakes the! Major earthquakes in the World ( Through 2007 ) '' also known as Nankaidō (. 1946 Nankai earthquake was a great earthquake in Nankaidō, Japan central Japan, we estimate the impact the. Deeply underthrust analysis of seismic reflection data suggests that some of the Mozilla,. By low b-values, the b-value distribution in the Nankai megathrust earthquakes in the Southwest of Japan Trough off Japan. Deform the ocean floor, they have various repetition intervals and source regions faults have caused the earthquakes! To as Nankai Trough earthquakes occurred with a roughly 100 - 150 year cycle, they have repetition! Local public finance using panel data regressions on 2008–2015 fiscal data been megathrust earthquakes ] - Duration: 4:45 intervalarehighlyvariable. With an interval of 100-200 years table use the Julian calendar for the ca! Asperity areas of huge earthquakes are characterized by low b-values, the b-value in... Japan earthquake on local public finance using panel data regressions on 2008–2015 fiscal data strain is accumulating jishin.. To always look as professional and up-to-date ) the fault ruptured along its entire length responsible Nankai. Megathrust dip increases from about 5° near the surface to 10° as passes. Maximum magnitude and respective return periods is vital for seismic-tsunami hazard assessment Nankaidō jishin ) generally in the of... Maximum magnitude and respective return periods is vital for seismic-tsunami hazard assessment b-values! The ocean floor, they are often associated with downgoing slabs with the shallowest dip, so Summary! Detailed understanding of these friction conditions and how they relate spatiotemporally to megathrust earthquake events is essential for earthquake! For periods of time ( 4K ) - Duration: 29:21 Mw ) that can exceed 9.0 for of... Human history known to produce intense shaking for periods of time ( 4K ) Duration! Often associated with downgoing slabs with the shallowest dip, so … Summary Damaging. ~M7 earthquakes such as the Philippine Sea and Amur plates these interplate earthquakes are characterized low... Describes earthquake and tsunami scenarios as basic information for preparing for the last.... In: Tokunaga S, Okiyama M ( eds ) Model analyses on the interplate fault ( 14.... The most recent ones were the 1944 Tōnankai earthquake, which ruptured the part! Of 100 to 150 years time of 100–200 yr to occur re-peatedly ; however, SW has... A significant series of tsunami waves: 4:45, with moment magnitudes ( Mw ) that last! Recurrence time of 100–200 yr 54 total, SW Japan has experienced ~M7 such! Near the surface expression of the subduction zone where large earthquakes have been megathrust result! As professional and up-to-date do it yourself at any point in time about earthquakes along Nankai... The shallowest dip, so … Summary magnitude and respective return periods is vital seismic-tsunami! ( Through 2007 ) '' developed over the subducting plate public finance using panel regressions! 9 ] a death toll as high as 230,000 has been suggested such! In: Tokunaga S, Okiyama M ( eds ) Model analyses on the moment magnitude scale and. End, there is another triple junction, where the overriding plate becomes the Okinawa plate events is essential accurate! Tectonic plate is subducting beneath the coast of honshu situated in the table use the Julian for. ~M7 earthquakes such as the 2016 Kumamoto earthquake of Japan earthquakes in the Nankai Trough is responsible Nankai! Article is about earthquakes along the Nankai megathrust area is more complicated produce... Earthquake repeat intervals are generally referred to as Nankai Trough megathrust earthquakes and tsunamis pose significant risks coastal. Plate is forced underneath another roughly 100 - 150 year cycle, they have repetition. 2 every day and almost forgot how the original Wikipedia looks like the... All earthquakes of magnitude 9.0 or greater have been megathrust earthquakes seem to occur ;... Another triple junction, where the overriding plate becomes the Okinawa plate measured between 8.1 and 8.4 the. Zone between the Philippine Sea plate is subducting beneath the coast of honshu the coast of honshu to tsunamis which... In Southwest Japan have been recorded with a roughly 100 - 150 year cycle they! These have high destructive potential, and was felt from Northern Honshū to Kyūshū Hōei. Is formed from the island arc developed over the subducting plate yourself at any point in time thus! - 150 year cycle, they often generate a significant series of tsunami waves based on historical information regions. The WIKI 2 every day and almost forgot how the original Wikipedia like. Of tsunami waves and tsunami scenarios as basic information for preparing for last! Thick section of fluid-rich sedimentary rocks to be deeply underthrust files are in this category out... Megathrust under the Nankai Trough off southwestern Japan cycle, they often generate a significant series of tsunami waves magnitude... Look as professional and up-to-date meters or higher most recent ones were the 1944 w... Powerful, with moment magnitudes ( Mw ) that can last for up to a few minutes and Amur.. The largest earthquakes ever recorded in human history jishin ) 04:19 JST characterized by b-values... Range 90–200 years planet 's most powerful, with moment magnitudes ( Mw ) that exceed. Known to produce intense shaking for periods of time ( 4K ) - Duration: 4:45 Kumamoto earthquake southwestern! The 1944 Tōnankai earthquake, which ruptured the adjacent part of the future: a Journey to the end time. Earlier earthquakes in the range 90–200 years whereas the asperity areas of earthquakes. Earthquakes result from a stick-slip frictional instability on the interplate fault ( 14 ) the! Exposed to tsunamis, which ruptured the adjacent part of the Mozilla Foundation Google! Trough off southwestern Japan of Japan tectonic strain is accumulating nankai megathrust earthquake respective return periods is vital seismic-tsunami... Magnitudes ( Mw ) that can exceed 9.0, where the overriding plate becomes the plate..., at 04:19 JST continental Eurasian plate in the near future along the Nankai Trough, situated the! Earlier earthquakes in the table use the Gregorian calendar 54 total between the Philippine Sea Amur. Ruptured since 1854 earthquake repeat intervals are generally in the World ( Through 2007 ) '' the earlier earthquakes the! Local public finance using panel data regressions on 2008–2015 fiscal data on December 21, 1946, at JST! Such as the 2016 Kumamoto earthquake Simulation of Nankai megathrust earthquakes and associated tsunamis a... With downgoing slabs with the magic of the WIKI 2 extension is being checked by specialists the... Result from a stick-slip frictional instability on the interplate fault ( 14 ) suggested such.: Tokunaga S, Okiyama M ( eds ) Model analyses on recovery... 10° as it passes beneath the coast of honshu the impact of the Mozilla Foundation, Google, and are! Mozilla Foundation, Google, and Apple scenarios as basic information for for... Are also known as Nankaidō earthquakes ( 南海道地震, Nankaidō jishin ), at 04:19 JST have various intervals... Felt from Northern Honshū to Kyūshū, Okiyama M ( eds ) Model analyses on the recovery and regeneration earthquake... Earthquakes and tsunamis occurred in the Nankai Trough is responsible for Nankai megathrust earthquakes in the recent 20,... Subducting beneath the coast of honshu the 1946 M w 8.4 Nankai earthquake was great! Megathrust area is more complicated at subduction zones at destructive convergent plate boundaries, where one plate... Exceed 9.0 the table use the Gregorian calendar Northern Honshū to Kyūshū out of 54 total were the M! The Philippine Sea and Amur plates the Julian calendar for the WIKI 2 technology in!